$ 20 \; mL \; NaOH \; 0.05 \; M $ titrated by $ HCl \; 0.1 \; M $ Calculate the volume $ V_e $ of acid added at the equivalent point

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$V_e\cdot c_{acid}=V_i\cdot c_{base}$ $V_e\cdot 0.1=0.020\cdot 0.05$ $V_e=0.010\;L$